1. State Key Laboratory of Coal Mine Disaster Dynamics and Control, School of Resources and Safety Engineering, Chongqing University, No. 174 Shazheng Street, Chongqing 400044, China;
2. School of Mining and Petroleum Engineering, Department of Civil and Environmental Engineering, University of Alberta, Edmonton, AB T6G 1H9, Canada
3. State Key Laboratory of Coal Mine Disaster Dynamics and Control, Chongqing University, No. 174, Shazheng Street, Chongqing 400044, China
4. Craft and Hawkins Department of Petroleum Engineering, Louisiana State University, Baton Rouge, LA 70803